- Jemail Karami- The personality of a terrorist. He had David's telepathy.
- Jack Wayne- "Swaggering adventurer". He had David's telekinesis.
- Cyndi- A rebellious girl. She had David's pryokinesis.
When he was cured for the first time, he could control all of these abilities and time travel. In the current New Mutant run, Legion power's changed so each of his personalities had their own powers, even if they were psychical powers such as a prehensile tongue. Other powers included X-ray vision, matter animation, sonic screams and super strength. Cannonball explained this was part of his new mutation.